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Eric Paroissien – One of the best experts on this subject based on the ideXlab platform.

  • Simplified Stress analysis of multilayered bonded structure under 1D-bar kinematics
    Composite Structures, 2020
    Co-Authors: Vincent Torrelli, Eric Paroissien

    Abstract:

    Many current materials and structural systems are layered. The structural performances of these multilayered systems are dependent on interfaces, the presence of which is inherent to them. A methodology for the simplified Stress analysis of such structures under 1D-bar kinematics is presented. The macro-element technique is used to solve the set of ordinary differential equations involved. A dedicated macro-element is formulated through the approximation of displacements fields by Taylor expansion power series. The predictions of the simplified Stress analysis are in close agreements with those obtained by FE analyses. Finally, the influence of Adhesive thickness and of the overlap length on the Adhesive Stress peaks is presented.

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  • Simplified Stress analysis of multilayered Adhesively bonded structures
    International Journal of Adhesion and Adhesives, 2020
    Co-Authors: Kübra Sekmen, Eric Paroissien, Frederic Lachaud

    Abstract:

    Bolting technologies have been commonly used to assemble structural members in order to carry loads. However, the main drawback of these joints is the local reduction of the strength-to-Stress ratio. Compared to the bolted joints, Adhesive bonding technology allows for the increase of static and fatigue strength while reducing the weight. The Finite Element (FE) method is able to address the Stress analysis of bonded joints. Nevertheless, analyses based on FE models are computationally expensive. Therefore, it is profitable to develop new simplified approaches enabling extensive parametric studies. A semi-analytical technique was developed to model the joints based on the formulation of 4-node special elements, termed macro-elements, which is able to simulate an entire bonded overlap at low computational costs. In this paper, a multilayered bonded-bars and a multilayered bonded-beams macro-elements are derived from bonded-bar and bonded-beam macro-elements. 1D-bar and 1D-beam simplified Stress analyses of such multilayered joints are presented in order to predict the Adhesive Stress distributions along the overlap. For validation purpose, the results obtained by the simplified 1D-bar and 1D-beam model are compared with the results predicted by 1D-FE models. Good agreements are shown. Finally, the parametric studies are performed in order to understand the mechanical behavior of multilayered Adhesively bonded structures. This presented simplified Stress analysis can be used to deduce the sizing guidelines as a consequence of these parametric studies.

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  • Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
    Composite Structures, 2018
    Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic Lachaud

    Abstract:

    – Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and

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Frederic Lachaud – One of the best experts on this subject based on the ideXlab platform.

  • Simplified Stress analysis of multilayered Adhesively bonded structures
    International Journal of Adhesion and Adhesives, 2020
    Co-Authors: Kübra Sekmen, Eric Paroissien, Frederic Lachaud

    Abstract:

    Bolting technologies have been commonly used to assemble structural members in order to carry loads. However, the main drawback of these joints is the local reduction of the strength-to-Stress ratio. Compared to the bolted joints, Adhesive bonding technology allows for the increase of static and fatigue strength while reducing the weight. The Finite Element (FE) method is able to address the Stress analysis of bonded joints. Nevertheless, analyses based on FE models are computationally expensive. Therefore, it is profitable to develop new simplified approaches enabling extensive parametric studies. A semi-analytical technique was developed to model the joints based on the formulation of 4-node special elements, termed macro-elements, which is able to simulate an entire bonded overlap at low computational costs. In this paper, a multilayered bonded-bars and a multilayered bonded-beams macro-elements are derived from bonded-bar and bonded-beam macro-elements. 1D-bar and 1D-beam simplified Stress analyses of such multilayered joints are presented in order to predict the Adhesive Stress distributions along the overlap. For validation purpose, the results obtained by the simplified 1D-bar and 1D-beam model are compared with the results predicted by 1D-FE models. Good agreements are shown. Finally, the parametric studies are performed in order to understand the mechanical behavior of multilayered Adhesively bonded structures. This presented simplified Stress analysis can be used to deduce the sizing guidelines as a consequence of these parametric studies.

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  • Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
    Composite Structures, 2018
    Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic Lachaud

    Abstract:

    – Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and

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  • Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
    Composite Structures, 2018
    Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic Lachaud

    Abstract:

    – Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and

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Chihdar Charles Yang – One of the best experts on this subject based on the ideXlab platform.

  • Stress model and strain energy release rate of a prescribed crack in scarf joint repair of composite panels
    Journal of Composite Materials, 2015
    Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia Salah

    Abstract:

    An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar…

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  • Stress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panels
    Journal of Composite Materials, 2015
    Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia Salah

    Abstract:

    An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar…

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  • Strain energy release rate determination of prescribed cracks in Adhesively-bonded single-lap composite joints with thick bondlines
    Composites Part B-engineering, 2008
    Co-Authors: Chihdar Charles Yang, Alireza Chadegani, John Tomblin

    Abstract:

    An analytical model for determining the strain energy release rate due to a prescribed crack in an Adhesively-bonded, single-lap composite joint with thick bondlines and subjected to axial tension is presented. An existing analytical model for determining the Adhesive Stresses within the joint is used as the foundation for the strain energy release rate calculation. In the Stress model, the governing equations of displacements within the adherends are formulated using the first-order laminated plate theory. In order to simulate the thick bondlines, the field equations of the Adhesive are formulated using the linear elastic theory to allow non-uniform Stress distributions through the thickness. Based on the Adhesive Stress distributions, the equivalent crack tip forces are obtained and the strain energy release rate due to the crack extension is determined by using the virtual crack closure technique (VCCT). The specimen geometry of ASTM D3165 standard test is followed in the derivation. The system of second-order differential equations is solved to provide the adherend and Adhesive Stresses using the symbolic computational tool, Maple 7. Finite element analyses using J-integral as well as VCCT are performed to verify the developed analytical model. Finite element analyses are conducted using the commercial finite element analysis software ABAQUS™. The strain energy release rates determined using the analytical method correlate well with the results from the finite element analyses. It can be seen that the same prescribed crack has a higher strain energy release rate for the joints with thicker bondlines. This explains the reason that joints with thick bondlines tend to have a lower load carrying capacity.

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